Apparatus and example methods for environment-mapped style of bump-mapping (EMBM) are provided that use a pre-computed bump-map texture accessed as an indirect texture along with pre-computed object surface normals (i.e., the normal, tangent and binormal vectors) from each vertex of rendered polygons to effectively generate a new perturbed normal vector per vertex. The perturbed new normal vectors are then used to look up texels in an environment map. A specialized bump map texture data/coordinate processing “bump unit” is provided in the graphics pipeline for performing predetermined matrix multiplication operations on retrieved lookup data from the indirect-texture bump map.
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18. In a graphics system, in a graphics pipeline, texture processing components coupled to a texture memory, said texture processing components performing texture mapping and environment-mapped bump mapping in response to applied texture coordinates, comprising:
texture coordinate processing circuitry for identifying indirect texture coordinates and receiving bump function difference data retrieved from a texture map stored in texture memory;
matrix multiplication circuitry for performing eye-space coordinate transformations on texture coordinate data; and
buffer circuitry for saving computed texture coordinates.
10. In a graphics system including a graphics processor that generates image information for display at least in part in response to stored texture images, said graphics processor including texture processing components coupled to a texture memory, said texture processing components performing texture mapping in response to applied texture coordinates, a method of performing environment-mapped bump mapping comprising:
storing environment image mapping data in said texture memory;
storing bump mapping data in said texture memory;
generating indirect texture coordinates;
using said indirect texture coordinates to retrieve said bump mapping data stored in texture memory;
generating computed texture coordinates based at least in part on retrieved bump mapping data; and
using said computed texture coordinates to retrieve pixel color data from said environment image mapping data stored in said texture memory; and
outputting retrieved pixel color data for use in rendering a graphics object having an environment-mapped bump-mapped texture.
1. In a graphics system including a processing pipeline that renders and displays images at least in part in response to polygon vertex data and texture image data stored in memory, an arrangement for implementing environment-mapped bump mapping in a single rendering pass, comprising:
texture memory for storing image data and bump mapping data;
texture retrieval circuitry for accessing and retrieving data stored in texture memory; and
texture coordinate/bump processing circuitry coupled to the texture retrieval circuitry and configured to receive data retrieved from texture memory for generating a set of modified texture coordinates, said texture coordinate/bump processing circuitry including multiplication circuitry for performing at least scaling of texture coordinates and a storage buffer for saving a set of modified texture coordinates for reuse by the texture retrieval circuitry in accessing texels of at least an environment map image and/or one or more corresponding texture image data maps stored in texture memory multiple texture image data maps in the texture memory;
wherein the texture retrieval circuitry is responsive to a set of indirect texture coordinates to provide said texture coordinate/bump processing circuitry with data retrieved from the texture memory for use in generating said set of modified texture coordinates.
6. In a graphics system that renders and displays images at least in part in response to polygon vertex data and texture data stored in memory, said system capable of direct and indirect texture coordinate processing, a method [dXdYdZ] of environment-mapped bump mapping based on a bump map function modeled with respect to a 3d surface, comprising the steps of:
precomputing forward difference values of a surface bump function F(u, v) modeled with respect to a particular 3d surface and storing said values as a texture map in memory;
supplying, for each of the plural vertices, model-space data representing a surface normal vector,
converting said normal vectors to eye-space;
generating texture coordinate values using only x and y eye-space vector components of said normal vectors;
interpolating said texture coordinate values across a polygon of an object being rendered;
using said interpolated texture coordinates in an indirect mode of texture coordinate processing for looking up, in said texture map, a set of precomputed forward difference values of a surface bump function F(u, v) modeled with respect to a 3d surface;
computing a set of perturbed texture coordinates based on said interpolated texture coordinates and said set of precomputed forward difference values;
using said set of perturbed texture coordinates for performing a lookup in memory to a texel in an environment texture map; and
using said texel to determine a pixel color.
8. In a graphics system that renders and displays images at least in part in response to polygon vertex data and texture data stored in memory, said system capable of direct and indirect modes of texture coordinate processing wherein, in an indirect texture coordinate processing mode, stored texture data is retrieved and used for further texture coordinate processing, a dsdt method of environment-mapped bump mapping based on a bump map function modeled with respect to a flat surface, comprising the steps of:
supplying, for each of the plural vertices, model-space data representing a surface normal vector, a tangent vector and binormal vector;
converting said normal, tangent vector and binormal vectors to eye-space;
generating texture coordinate values using only x and y eye-space vector components of said normal, tangent vector and binormal vectors;
interpolating said texture coordinate values across a polygon comprising a surface of an object being rendered for a pixel;
using interpolated texture coordinates of said normal vector, in an indirect mode of texture coordinate processing, for looking up a set of precomputed forward difference values, Fu and Fv, of a surface bump function F(u, v) modeled in two dimensions with respect to a flat surface, wherein said precomputed forward difference values are stored as a texel in a texture data map stored in memory;
computing a set of perturbed texture coordinates based on said interpolated texture coordinates and said set of precomputed forward difference values;
using said set of perturbed texture coordinates for performing multiple lookups to a texel in a plurality of different color and/or image data maps stored as texture data in memory, wherein at least one data maps is a light map and at least one of said maps is an environment texture map; and
blending texel color data from each of said multiple lookups to determine a pixel color.
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This application claims the benefit of U.S. application Ser. No. 09/722,381, filed Nov. 28, 2000, and U.S. Provisional Application Ser. No. 60/226,893, filed Aug. 23, 2000, the entire contents of which are hereby incorporated by reference.
The present invention relates to computer graphics, and more particularly to interactive graphics systems such as home video game platforms. Still more particularly this invention relates to a method and apparatus for performing environment mapped bump-mapping in a graphics system.
Many of us have seen films containing remarkably realistic dinosaurs, aliens, animated toys and other fanciful creatures. Such animations are made possible by computer graphics. Using such techniques, a computer graphics artist can specify how each object should look and how it should change in appearance over time, and a computer then models the objects and displays them on a display such as your television or a computer screen. The computer takes care of performing the many tasks required to make sure that each part of the displayed image is colored and shaped just right based on the position and orientation of each object in a scene, the direction in which light seems to strike each object, the surface texture of each object, and other factors.
Because computer graphics generation is complex, computer-generated three-dimensional graphics just a few years ago were mostly limited to expensive specialized flight simulators, high-end graphics workstations and supercomputers. The public saw some of the images generated by these computer systems in movies and expensive television advertisements, but most of us couldn't actually interact with the computers doing the graphics generation. All this has changed with the availability of relatively inexpensive 3D graphics platforms such as, for example, the Nintendo 64® and various 3D graphics cards now available for personal computers. It is now possible to interact with exciting 3D animations and simulations on relatively inexpensive computer graphics systems in your home or office.
One problem graphics system designers confronted in the past was how to create realistic looking surface detail on a rendered object without resorting to explicit modeling of the desired details with polygons or other geometric primitives. Although surface details can be simulated, for example, using myriad small triangles with interpolated shading between vertices, as the desired detail becomes finer and more intricate, explicit modeling with triangles or other primitives places high demands on the graphics system and becomes less practical. An alternative technique pioneered by E. Catmull and refined by J. F. Blinn and M. E. Newell is to “map” an image, either digitized or synthesized, onto a surface. (See “A Subdivision Algorithm for Computer Display of Curved Surfaces” by E. Catmull, Ph.D. Thesis, Report UTEC-CSc-74-133, Computer Science Department, University of Utah, Salt Lake City, Utah, December 1994 and “Texture and Reflection in Computer Generated Images” by J. F. Blinn and M. E. Newell, CACM, 19(10), October 1976, 452–457). This approach is known as texture mapping (or pattern mapping) and the image is called a texture map (or simply referred to as a texture). Alternatively, the texture map may be defined by a procedure rather than an image.
Typically, the texture map is defined within a 2D rectangular coordinate space and parameterized using a pair of orthogonal texture coordinates such, as for example, (u, v) or (s, t). Individual elements within the texture map are often called texels. At each rendered pixel, selected texels are used either to substitute for or to scale one or more material properties of the rendered object surface. This process is often referred to as texture mapping or “texturing.”
Although most 3-D graphics rendering systems now include a texturing subsystem for retrieving textures from memory and mapping the textures onto a rendered object surface, another problem confronting graphics system designers is how to texture a 3D object with realistic-looking surface characteristics that react to various lighting conditions in a manner similar to the surface of an actual object having, for example, random surface flaws, irregularities, roughness, bumps or other slight non-planar surface variations. Regular texture mapping does not provide such realism because texture images are generally two-dimensional and can not react or change in appearance in response to changes in position or direction of the lighting within a rendered scene. While in some instances such minute surface characteristics might be actually modeled, the time required for translating and rendering a 3D object with such a complex surface would be prohibitive for most real-time or interactive gaming applications. Consequently, various solutions to this problem were offered. For example, a technique generally known as “bump-mapping” was developed which allowed one to approximate the effect that non-planar surface variations would produce on lighted object. See, for example, J. F. Blinn “Simulation of Wrinkled Surfaces” Computer Graphics, (SIGRAPH '78 Proceedings), vol. 12, No. 3, pp. 286–292 (August 1978) and “Models of Light Reflection for Computer Synthesized Pictures”, Proc. 4th Conference on Computer Graphics and Instructive Techniques, 1977.
Basically, bump-mapping allows a graphics application programmer to add realism to the surface of an object without using a lot of geometry by modeling small surface variations as height differences and then applying those difference values over a surface as perturbations to a surface Normal vector used in computing surface lighting effects. Effectively, a bump-map modifies the shading of a polygon (or primitive) by perturbing the surface Normal on a per-pixel basis. The shading makes the surface appear bumpy, even though the underlying geometry is relatively flat.
Although conventional bump-mapping techniques offer some improvement, a further problem confronting graphics system designers is that conventional approaches to simple forms of bump-mapping, such as the “emboss”-style of bump mapping, typically only consider the interaction between a bump map and a single diffuse light source. Moreover, in many cases, the bump map is inconveniently “tied” to a specific geometric shape in the sense that it should be constructed (i.e., parameterized) for an object having a particular surface geometry and only works well for geometrically similar surfaces. In addition, if the object is rotated, the bump map will not apply to the entire surface (e.g., newly visible surface regions after rotation).
Another known technique for providing realistic looking surface on a rendered object uses a method called “environment mapping”. Environment mapping (EM), also called “reflection mapping”, is a simple yet powerful method of generating approximations of reflections in curved surfaces. This technique was introduced by Blinn and Newell, “Texture and Reflection In Computer Generated Images,” Communications of the ACM, Vol. 19, no. 10, pp. 542–547 (October 1976). Conventionally, methods start with a ray from the viewer to a point on the reflector. This ray is then reflected with respect to the normal at that point. Instead of finding the intersection with the closest surface, as is done in ray tracing processes, EM uses the direction of the reflection vector as an index to an image containing the environment. The environment mapping approximation assumes that the objects and lights being reflected with EM are far away, and that the reflector will not reflect itself. If these assumptions hold, then the environment around the reflector can be treated as a two-dimensional projection surrounding it.
The basic steps for environment mapping are as follows:
In addition, there are a variety of known “projector” functions that may be used to map the reflection vector into one or more textures. Blinn and Newell's algorithm and Grene's cubic environment mapping technique are classic mapping methods, although a sphere map is also commonly used.
While much work has been done in the past, further improvements are possible and desirable.
The present invention improves on prior techniques by providing an apparatus and example procedures for performing an environment-mapped bump-mapping (EMBM). In accordance with one aspect provided by this invention, environment mapped bump mapping in a graphics system is performed by generating texture coordinates from parameters of a surface; bump mapping to perturb the texture coordinates; environment mapping based on the perturbed texture coordinates; and displaying an image obtained from the environment mapping. The bump mapping may model surface perturbations using a three-dimensional model in modeling space, or it may model the surface perturbations in two dimensions in eye-space. These different modeling techniques provide different advantages and features.
In more detail, one environment mapped bump mapping technique uses a bump map to model surface perturbations in three dimensions. The output of the bump mapping operation is provided to a matrix multiplication operation that allows rotation in any direction. The resulting rotated values are combined with Normal vector values for environment mapping.
In another embodiment, the bump map models surface perturbations in two dimensions using partial derivatives. The bump map output is combined with Normal vector partial derivatives using a sum-of-product calculation to provide texture coordinates for environment mapping. The inverse of the transformation matrix is used for geometric transformations to transform the Normal vector partial derivatives.
In more detail, a first example EMBM procedure is provided that permits very fast processing of object surface Normal perturbations modeled in 3D (dXdYdZ) for specific object surface geometries using a pre-computed bump map stored in memory as a texture. A second example EMBM procedure is provided for Normal perturbations modeled with respect to a flat surface (dSdT) which frees the bump map from use with a particular surface geometry and allows it to be applied with environment mapping/lighting to a variety of different rendered object shapes.
The EMBM method provided by an aspect of the present invention uses a pre-constructed bump-map texture accessed as an indirect texture along with pre-computed object surface normals (i.e., the Normal, Tangent and Binormal vectors) from each vertex of rendered polygons to effectively generate a new perturbed Normal vector per vertex. The new perturbed Normal vectors are then used to look up an environment texture map. For example, the environment texture map may be a spherical reflection map of an environment surrounding a rendered object or a texture map containing lighting or other data for creating more complex surface lighting effects.
The example embodiment provides a specialized texture data/coordinate processing “bump unit” in the graphics pipeline for performing predetermined matrix multiplication operations (e.g., modeling-space to eye-space conversions) on retrieved lookup data from the indirect-texture bump map. The bump unit (e.g., see
In accordance with a further aspect provided by the invention, object surface Normal perturbations for one or more specific surface geometries are modeled in 3D using a pre-computed dXdYdZ bump map stored in memory as a texture prior to running a particular graphics application (i.e., texel values within an individual bump-map specify surface Normal vector offsets per vertex in 3D model space). A texturing pipeline implemented in hardware then performs an environment-mapped bump-mapped dXdYdZ texture lookup. In the disclosed example embodiment, this is implemented using an indirect texture look-up to obtain the dXdYdZ bump map data to compute a perturbed texture coordinate for lookup into, for example, a spherical reflection environment map. At runtime, the graphics application matches an object having a particular surface geometry with the pre-computed dXdYdZ bump-map texture for that geometry and accesses the bump-map as an “indirect” texture.
A programmable 3×2 multiplication matrix can be implemented by bump unit hardware to provide improved versatility when rendering and displaying such dXdYdZ bump-mapped objects. For example, the matrix may be programmably loaded with appropriate transform constants for allowing conversion of texture coordinate components to eye-space or dynamically loaded with texture coordinates for implementing dXdYdZ bump-mapped texturing while rotating an object about two or more orthogonal axes. The dXdYdZ bump-map indirect look-up data is then used along with per vertex Normal-generated texture coordinate components to compute the perturbed texture coordinates for the look-up into an environment map.
Although the dXdYdZ bump-map textures are custom parameterized for individual surface geometries and, consequently, are effectively “tied” to the particular object for which they were designed, this approach to EMBM is advantageous in that processing is very fast, requiring only a single texture coordinate processing stage corresponding to a single shading/color-blending stage. Moreover, in a preferred implementation of the present invention, the bump-mapped objects may be dynamically rotated about at least two orthogonal axes without disruption to the bump-mapped effect on the object surface.
In accordance with another aspect provided by the invention, object surface Normal perturbations are initially modeled with respect to a flat surface, then during application runtime, the Normal perturbations may be mapped to a rendered object surface having a different or arbitrary geometric configuration. A pre-computed bump dSdT map containing partial derivative data is stored in memory as a 2D texture and subsequently accessed as an “indirect” texture. The pre-computed dSdT bump map data may be derived, for example, by forward differencing the data from a conventional paint program 2D or other image. Basically, Normal, Tangent and Binormal vectors, which are specified per vertex as polygon vertex attributes of a modeled 3D object surface, are first rotated (transformed) into view-space (eye-space/camera-space) and then used along with the precomputed bump map data to compute a perturbed Normal for each vertex. The perturbed Normal is then used to look up a light or environment map. In other words, Binormal- and Tangent-generated texture coordinate components are scaled (multiplied) by the pre-computed partial derivative dSdT bump map data (stored as an indirect texture) and then are combined with Normal vector generated texture coordinate components over several cycles/stages. The resulting computed texture coordinates correspond to an appropriately perturbed Normal vector, which is then used to look-up a light or environment map.
These and other features and advantages provided by the invention will be better and more completely understood by referring to the following detailed description of presently preferred embodiments in conjunction with the drawings, of which:
In this example, system 50 is capable of processing, interactively in real time, a digital representation or model of a three-dimensional world. System 50 can display some or all of the world from any arbitrary viewpoint. For example, system 50 can interactively change the viewpoint in response to real time inputs from handheld controllers 52a, 52b or other input devices. This allows the game player to see the world through the eyes of someone within or outside of the world. System 50 can be used for applications that do not require real time 3D interactive display (e.g., 2D display generation and/or non-interactive display), but the capability of displaying quality 3D images very quickly can be used to create very realistic and exciting game play or other graphical interactions.
To play a video game or other application using system 50, the user first connects a main unit 54 to his or her color television set 56 or other display device by connecting a cable 58 between the two. Main unit 54 produces both video signals and audio signals for controlling color television set 56. The video signals are what controls the images displayed on the television screen 59, and the audio signals are played back as sound through television stereo loudspeakers 61L, 61R.
The user also needs to connect main unit 54 to a power source. This power source may be a conventional AC adapter (not shown) that plugs into a standard home electrical wall socket and converts the house current into a lower DC voltage signal suitable for powering the main unit 54. Batteries could be used in other implementations.
The user may use hand controllers 52a, 52b to control main unit 54. Controls 60 can be used, for example, to specify the direction (up or down, left or right, closer or further away) that a character displayed on television 56 should move within a 3D world. Controls 60 also provide input for other applications (e.g., menu selection, pointer/cursor control, etc.). Controllers 52 can take a variety of forms. In this example, controllers 52 shown each include controls 60 such as joysticks, push buttons and/or directional switches. Controllers 52 may be connected to main unit 54 by cables or wirelessly via electromagnetic (e.g., radio or infrared) waves.
To play an application such as a game, the user selects an appropriate storage medium 62 storing the video game or other application he or she wants to play, and inserts that storage medium into a slot 64 in main unit 54. Storage medium 62 may, for example, be a specially encoded and/or encrypted optical and/or magnetic disk. The user may operate a power switch 66 to turn on main unit 54 and cause the main unit to begin running the video game or other application based on the software stored in the storage medium 62. The user may operate controllers 52 to provide inputs to main unit 54. For example, operating a control 60 may cause the game or other application to start. Moving other controls 60 can cause animated characters to move in different directions or change the user's point of view in a 3D world. Depending upon the particular software stored within the storage medium 62, the various controls 60 on the controller 52 can perform different functions at different times.
Example Electronics of Overall System
a main processor (CPU) 110,
a main memory 112, and
a graphics and audio processor 114.
In this example, main processor 110 (e.g., an enhanced IBM Power PC 750) receives inputs from handheld controllers 108 (and/or other input devices) via graphics and audio processor 114. Main processor 110 interactively responds to user inputs, and executes a video game or other program supplied, for example, by external storage media 62 via a mass storage access device 106 such as an optical disk drive. As one example, in the context of video game play, main processor 110 can perform collision detection and animation processing in addition to a variety of interactive and control functions.
In this example, main processor 110 generates 3D graphics and audio commands and sends them to graphics and audio processor 114. The graphics and audio processor 114 processes these commands to generate interesting visual images on display 59 and interesting stereo sound on stereo loudspeakers 61R, 61L or other suitable sound-generating devices.
Example system 50 includes a video encoder 120 that receives image signals from graphics and audio processor 114 and converts the image signals into analog and/or digital video signals suitable for display on a standard display device such as a computer monitor or home color television set 56. System 50 also includes an audio codec (compressor/decompressor) 122 that compresses and decompresses digitized audio signals and may also convert between digital and analog audio signaling formats as needed. Audio codec 122 can receive audio inputs via a buffer 124 and provide them to graphics and audio processor 114 for processing (e.g., mixing with other audio signals the processor generates and/or receives via a streaming audio output of mass storage access device 106). Graphics and audio processor 114 in this example can store audio related information in an audio memory 126 that is available for audio tasks. Graphics and audio processor 114 provides the resulting audio output signals to audio codec 122 for decompression and conversion to analog signals (e.g., via buffer amplifiers 128L, 128R) so they can be reproduced by loudspeakers 61L, 61R.
Graphics and audio processor 114 has the ability to communicate with various additional devices that may be present within system 50. For example, a parallel digital bus 130 may be used to communicate with mass storage access device 106 and/or other components. A serial peripheral bus 132 may communicate with a variety of peripheral or other devices including, for example:
a processor interface 150,
a memory interface/controller 152,
a 3D graphics processor 154,
an audio digital signal processor (DSP) 156,
an audio memory interface 158,
an audio interface and mixer 160,
a peripheral controller 162, and
a display controller 164.
3D graphics processor 154 performs graphics processing tasks. Audio digital signal processor 156 performs audio processing tasks. Display controller 164 accesses image information from main memory 112 and provides it to video encoder 120 for display on display device 56. Audio interface and mixer 160 interfaces with audio codec 122, and can also mix audio from different sources (e.g., streaming audio from mass storage access device 106, the output of audio DSP 156, and external audio input received via audio codec 122). Processor interface 150 provides a data and control interface between main processor 110 and graphics and audio processor 114.
Memory interface 152 provides a data and control interface between graphics and audio processor 114 and memory 112. In this example, main processor 110 accesses main memory 112 via processor interface 150 and memory interface 152 that are part of graphics and audio processor 114. Peripheral controller 162 provides a data and control interface between graphics and audio processor 114 and the various peripherals mentioned above. Audio memory interface 158 provides an interface with audio memory 126.
Example Graphics Pipeline
Command processor 200 receives display commands from main processor 110 and parses them—obtaining any additional data necessary to process them from shared memory 112. The command processor 200 provides a stream of vertex commands to graphics pipeline 180 for 2D and/or 3D processing and rendering. Graphics pipeline 180 generates images based on these commands. The resulting image information may be transferred to main memory 112 for access by display controller/video interface unit 164—which displays the frame buffer output of pipeline 180 on display 56.
Command processor 200 performs command processing operations 200a that convert attribute types to floating point format, and pass the resulting complete vertex polygon data to graphics pipeline 180 for rendering/rasterization. A programmable memory arbitration circuitry 130 (see
Transform unit 300 performs a variety of 2D and 3D transform and other operations 300a (see
Setup/rasterizer 400 includes a setup unit which receives vertex data from transform unit 300 and sends triangle setup information to one or more rasterizer units (400b) performing edge rasterization, texture coordinate rasterization and color rasterization.
Texture unit 500 (which may include an on-chip texture memory (TMEM) 502) performs various tasks related to texturing including for example:
Texture unit 500 outputs filtered texture values to the texture environment unit 600 for texture environment processing (600a). Texture environment unit 600 blends polygon and texture color/alpha/depth, and can also perform texture fog processing (600b) to achieve inverse range based fog effects. Texture environment unit 600 can provide multiple stages to perform a variety of other interesting environment-related functions based for example on color/alpha modulation, embossing, detail texturing, texture swapping, clamping, and depth blending. Texture environment unit 600 can also combine (e.g., subtract) textures in hardware in one pass. For more details concerning the texture environment unit 600, see commonly assigned application Ser. No. 09/722,367 entitled “Recirculating Shade Tree Blender for a Graphics System” and its corresponding provisional application Ser. No. 60/226,888, filed Aug. 23, 2000, both of which are incorporated herein by reference.
Pixel engine 700 performs depth (z) compare (700a) and pixel blending (700b). In this example, pixel engine 700 stores data into an embedded (on-chip) frame buffer memory 702. Graphics pipeline 180 may include one or more embedded DRAM memories 702 to store frame buffer and/or texture information locally. Z compares 700a′ can also be performed at an earlier stage in the graphics pipeline 180 depending on the rendering mode currently in effect (e.g., z compares can be performed earlier if alpha blending is not required). The pixel engine 700 includes a copy operation 700c that periodically writes on-chip frame buffer 702 to main memory 112 for access by display/video interface unit 164. This copy operation 700c can also be used to copy embedded frame buffer 702 contents to textures in the main memory 112 for dynamic texture synthesis effects. Anti-aliasing and other filtering can be performed during the copy-out operation. The frame buffer output of graphics pipeline 180 (which is ultimately stored in main memory 112) is read each frame by display/video interface unit 164. Display controller/video interface 164 provides digital RGB pixel values for display on display 102.
Example Environment-Mapped Bump Mapping Procedures
Texture coordinates are generated based on the surface parameters, and an indirect bump map texture is used to offset (perturb) the resulting texture coordinates (block 1400B). The perturbed texture coordinates are then used to look up an environment texture map (block 1400C). The environment texture map may contain complicated lighting effects, or it may be, for example, a spherical reflection map of the environment or any other desired environment map or maps. The resulting image may then be further processed and displayed (block 1400D).
Environment-mapped bump mapping (EMBM) in accordance with the present invention is accomplished in a preferred implementation through the use of indirect texture processing as described in the above reference copending patent application. This allows multiple texture lookups in a single rendering pass using low cost hardware.
There are at least two ways to model surface perturbations in a bump map in the example described above. One way is to use a three-dimensional model (e.g., a sphere, toroid, etc.) that matches (or closely approximates) the surface geometry of the 3D object being mapped. In this approach, a bump map of the three-dimensional model of the object describes height differences in three dimensions (x, y, z) relative to the surface being mapped. These differences in three dimensions (which may be represented by partial derivatives in each of the three coordinates corresponding to s, t, u texture coordinates) can be converted into eye space, translated (e.g., in the case of object rotation)—and then used to perturb texture coordinates generated in the conventional fashion from a surface Normal to provide new texture coordinates for Gouraud-shaded bump mapping.
Another way is to model surface perturbations in a bump map is to use a two-dimensional (i.e., flat surface) model. In this approach, the model need not correspond precisely to the surface geometry of the 3D object being mapped. A bump map of the two-dimensional model can describe height differences in two dimensions (x, y) relative to the surface being mapped. These height differences in two dimensions, which can be represented by partial derivatives in x and y, may be stored in a texture memory as partial derivatives (dSdT) and accessed using s and t texture coordinates. These partial derivatives may then be used to scale texture mapping coordinates generated from the surface binormals (i.e., the Tangent and Binormal vectors) and those values and the texture coordinates generated from the surface Normal vector are combined to produce perturbed Normal vector texture coordinates for Gouraud-shaded bump mapping.
In the first example implementation, Normal vector perturbations are modeled in 3D (dXdYdZ) with respect to a particular geometric shape (e.g., sphere, toroid, etc.) and, during application program run-time, are matched to corresponding similar geometric surfaces and transformed into eye-space. This method has the advantage that it renders bump-mapped images very quickly because it requires few coordinate processing stages to compute. In the second example implementation, perturbations of the Normal are modeled with respect to a flat surface (dSdT) and during run time may be mapped onto arbitrary object surfaces. This second method of implementation is more versatile but requires more coordinate processing stages and additional binormal surface vector information to calculate the perturbed Normal texture coordinates (see, for example, the above referenced copending application regarding coordinate processing and TEV stages for performing indirect texture referencing operations).
Environment-Mapped Bump-Mapping Based on Perturbations Modeled in 3D (dXdYdZ):
As indicated in the logical diagram of
Environment-Mapped Bump-Mapping Based on Perturbations Modeled with Respect to a Flat Surface (dSdT):
The partial derivatives provided by the indirect texture lookup are supplied to bump unit 500b.
(b0*db/ds)+(b1*db/dt), where b0 and b1 are the object surface binormals (i.e., Tangent and Bionormal vectors). Bump unit 500b then uses this result to effectively perturb the surface Normal (e.g., by summing). The resulting perturbed normal (actually perturbed texture coordinates) is then used for environment mapping 1434.
Block 1441 supplies the Normal, Binormal and Tangent vectors per vertex (this can be performed by transform unit 300). In one example embodiment, these values can be separately indexed per vertex to compress the amount of data needed for bump mapping. All of the vectors can share one base pointer.
Block 1441 also can rotate the vectors to eye space, and provides x and y coordinates. This can be done by setting up a Normal-based texture generation for the regular (non-indirect) texture coordinates (s2, t2) (s3, t3), (s4, t4) in
Block 1442 uses the texture coordinates s1, t2 to look up the partial derivative (height offset) data from the partial derivative bump map. These retrieved values are multiplied by the Tangent coordinates s2, t2 and the results are retained by the bump unit 500b. Block 1443 multiplies the Binormal coordinates s3, t3 by these same partial derivatives and added to the previous products. Block 1444 then adds the sum-of-products to the Normal coordinates s4, t4 to generated perturbed Normal coordinates for environment mapping. Block 1445 can reuse these values to look up any number of additional light or environment maps. The environment mapping are then blended with the surface illumination in a conventional manner (block 1446) and the results are displayed.
bump unit processing:
TEV Stages:
1. Tangent vector (T):
(Disable texture access)
(binormal 0) AFv
2. Binormal vector (B):
(Disable texture access)
(binormal 1) AFu + previous result
(recirculated)
3. Normal + previous result (recirculated):
lookup to lightmap 0
(N + Fv T + Fu B)
(e.g., specular)
4. Previous result (reuse)
lookup to lightmap 1
(e.g., diffuse)
5. S, T (reuse previous result)
surface texture (lookup to
environment texture)
In the above example, TEV stages 3 through 5 would perform blending as follows:
Theory of Operation
As explained above, bump mapping allows one to add realism to an image without using a lot of geometry. Basically, bump mapping modifies the shading of a polygon by effectively perturbing the surface normal on a per-pixel basis. The shading makes the surface appear bumpy, even though the underlying geometry is relatively flat. The following discussion briefly describes the basic mathematics of bump mapping:
Bump Mapping Mathematics:
In general, the “bumpiness” of a surface can be described by a 2D height field, also called a “bump map”. The bump map is generally defined by a scalar difference F(u, v) between a flat surface P(u, v) and a desired bumpy surface P′(u, v) along the normal N at each point (u, v). Thus, the bump surface may be represented as:
P′(u,v)=P(u,v)+F(u,v)
Normally, P is modeled using polygons, and F is modeled as a 2D image using a paint program or other tool. The normal Vector N′ at (u, v) can be calculated by the cross product of the partial derivatives of P′ in u and v. For this discussion, the partial derivative terms are defined by the following simplified notation:
Accordingly, the partial derivatives of P′(u, v) can be computed using the chain rule from (P′u×P′v)=
If F is assumed to be sufficiently small, the last term in the above two equations can be approximated by zero and, thus, the partial derivatives may be represented as:
Pu′=Pu+Fu
Pv′==Pv+Fv
Taking the cross product gives the following expression for N′:
Since by definition,
the equation for N′ can be simplified to:
Using the notation of
a perturbed Normal may be computed according to the following equation:
The values Fu and Fv may be computed offline, for example, through “forward differencing” of the 2D bump map. Pu and Pv may be computed either directly from the surface definition, or from forward differencing applied to the surface parameterization. Forward differencing is a known conventional method which may be used to compute (approximate) the first derivative of a height field (bump map) in a given direction. For example, assuming that a one-dimensional bump map is represented as the height function F(s), the forward difference would be represented by the following:
F1=F(s)−F(s+Δs)
If, for example, the delta is one texel in s, and the width of the bump map is w, then the forward difference is (assuming s is normalized to map coordinates):
If F were continuous, the above equations would approximate the first derivative of F. For a 2D bump map, a forward differencing operation may be performed by the following pseudo-code example:
For (t = 0; t < h; t++) {
For (s = 0; s < w; s++) {
tex00 = bump_imag(s,t);
tex01 = bump_imag(s+1, t);
tex10 = bump_imag(s, t+1);
Fs = tex00 - tex01;
Ft = tex00 - tex10;
}
}
Example API Environment-mapped Bump-mapping Function Commands:
As shown in
GXSetTevIndBumpXYZ
This function sets up an environment-mapped bump-mapped dXdYdZ texture indirect lookup. The indirect map specifies offsets in object (X, Y, Z) space. This kind of lookup requires only one TEV stages to compute. the indirect matrix should be loaded with a transformation for normals from object space to eye space. The surface geometry need only provide regular normals at each vertex.
Example Arguments:
Tev_stage
The TEV stage that is being affected
Ind_stage
The indirect stage results to use with this TEV stage.
Matrix-sel
Indicates which indirect matrix and scale value to use to
multiply the retrieved offsets.
Example Usage:
void GXSetTevIndBumpXYZ(
GXTevStageID tev_stage,
GXIndTexStageID ind_stage,
GXIndTexMtxId matrix_sel );
GXSetTevIndBumpST
This function sets up an environment-mapped bump-mapped dSdT texture indirect lookup. The indirect map specifies offsets in (S, T) space. This lookup function requires 3 TEV stages to compute the offset texture coordinates. The resulting texture coordinates are available two stages after the one specified in the function call. The first two TEV stages should disable texture lookup. The third stage is where the lookup is actually performed. One may use an API GXSetTevIndRepeat function (described below) in subsequent TEV stages to reuse the computed texture coordinates for additional lookups. The surface geometry should provide Normal/Binormal/Tangent vectors at each vertex. This function makes use of the dynamic form of matrices (
Example Arguments:
Tev_stage
The TEV stage that is being affected.
Ind_stage
The indirect stage results to use with this TEV stage.
Matrix_sel
Indicates which indirect matrix scale value to use to
multiply the retrieved offsets.
Example Usage:
void GXSetTevIndBumpSt (
GXTevStageID tev_stage,
GXIndTexStageID ind_stage,
GXIndTexMtxId matrix_sel );
Having used 3 TEV stages to compute a texture coordinate for an EMBM dSdT lookup, one can use the result to do more than one lookup to different texture maps in memory. For example, one may perform additional lookups for specular and diffuse lightmaps. In order to perform successive texture map lookups without taking 3 stages to compute each one, one may use the texture coordinate feedback feature of the present invention.
GXSetTevIndRepeat
This function is used when one wishes to use the same texture coordinates for one TEV stage as were computed in the previous stage. This is useful when the texture coordinates require more than one stage to compute, as is the case for GXSetTevIndBumpST operations.
Example Arguments:
tev_stage The TEV stage that is being changed.
Example Usage:
void GXSetTevIndRepeat (GXTevStageID tev_stage);
Other Example Compatible Implementations
Certain of the above-described system components 50 could be implemented as other than the home video game console configuration described above. For example, one could run graphics application or other software written for system 50 on a platform with a different configuration that emulates system 50 or is otherwise compatible with it. If the other platform can successfully emulate, simulate and/or provide some or all of the hardware and software resources of system 50, then the other platform will be able to successfully execute the software.
As one example, an emulator may provide a hardware and/or software configuration (platform) that is different from the hardware and/or software configuration (platform) of system 50. The emulator system might include software and/or hardware components that emulate or simulate some or all of hardware and/or software components of the system for which the application software was written. For example, the emulator system could comprise a general purpose digital computer such as a personal computer, which executes a software emulator program that simulates the hardware and/or firmware of system 50.
Some general purpose digital computers (e.g., IBM or MacIntosh personal computers and compatibles) are now equipped with 3D graphics cards that provide 3D graphics pipelines compliant with DirectX or other standard 3D graphics command APIs. They may also be equipped with stereophonic sound cards that provide high quality stereophonic sound based on a standard set of sound commands. Such multimedia-hardware-equipped personal computers running emulator software may have sufficient performance to approximate the graphics and sound performance of system 50. Emulator software controls the hardware resources on the personal computer platform to simulate the processing, 3D graphics, sound, peripheral and other capabilities of the home video game console platform for which the game programmer wrote the game software.
As one example, in the case where the software is written for execution on a platform using an IBM PowerPC or other specific processor and the host 1201 is a personal computer using a different (e.g., Intel) processor, emulator 1303 fetches one or a sequence of binary-image program instructions from storage medium 62 and converts these program instructions to one or more equivalent Intel binary-image program instructions. The emulator 1303 also fetches and/or generates graphics commands and audio commands intended for processing by the graphics and audio processor 114, and converts these commands into a format or formats that can be processed by hardware and/or software graphics and audio processing resources available on host 1201. As one example, emulator 1303 may convert these commands into commands that can be processed by specific graphics and/or or sound hardware of the host 1201 (e.g., using standard DirectX, OpenGL and/or sound APIs).
An emulator 1303 used to provide some or all of the features of the video game system described above may also be provided with a graphic user interface (GUI) that simplifies or automates the selection of various options and screen modes for games run using the emulator. In one example, such an emulator 1303 may further include enhanced functionality as compared with the host platform for which the software was originally intended.
In the case where particular graphics support hardware within an emulator does not include the example environment-mapped bump-mapping and indirect texture referencing features and functions illustrated by
While the logical diagrams of
A number of program modules including emulator 1303 may be stored on the hard disk 1211, removable magnetic disk 1215, optical disk 1219 and/or the ROM 1252 and/or the RAM 1254 of system memory 1205. Such program modules may include an operating system providing graphics and sound APIs, one or more application programs, other program modules, program data and game data. A user may enter commands and information into personal computer system 1201 through input devices such as a keyboard 1227, pointing device 1229, microphones, joysticks, game controllers, satellite dishes, scanners, or the like. These and other input devices can be connected to processing unit 1203 through a serial port interface 1231 that is coupled to system bus 1207, but may be connected by other interfaces, such as a parallel port, game port Fire wire bus or a universal serial bus (USB). A monitor 1233 or other type of display device is also connected to system bus 1207 via an interface, such as a video adapter 1235.
System 1201 may also include a modem 1154 or other network interface means for establishing communications over a network 1152 such as the Internet. Modem 1154, which may be internal or external, is connected to system bus 123 via serial port interface 1231. A network interface 1156 may also be provided for allowing system 1201 to communicate with a remote computing device 1150 (e.g., another system 1201) via a local area network 1158 (or such communication may be via wide area network 1152 or other communications path such as dial-up or other communications means). System 1201 will typically include other peripheral output devices, such as printers and other standard peripheral devices.
In one example, video adapter 1235 may include a 3D graphics pipeline chip set providing fast 3D graphics rendering in response to 3D graphics commands issued based on a standard 3D graphics application programmer interface such as Microsoft's DirectX 7.0 or other version. A set of stereo loudspeakers 1237 is also connected to system bus 1207 via a sound generating interface such as a conventional “sound card” providing hardware and embedded software support for generating high quality stereophonic sound based on sound commands provided by bus 1207. These hardware capabilities allow system 1201 to provide sufficient graphics and sound speed performance to play software stored in storage medium 62.
All documents referenced above are hereby incorporated by reference.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Patent | Priority | Assignee | Title |
10635909, | Dec 30 2015 | Texas Instruments Incorporated | Vehicle control with efficient iterative triangulation |
7952577, | Aug 14 2001 | DIGIMEDIA TECH, LLC | Automatic 3D modeling system and method |
7973705, | Jul 17 2009 | Garmin Switzerland GmbH | Marine bump map display |
8094150, | Aug 14 2001 | DIGIMEDIA TECH, LLC | Automatic 3D modeling system and method |
8289317, | Aug 14 2001 | DIGIMEDIA TECH, LLC | Automatic 3D modeling |
8451270, | Jun 25 2008 | Microsoft Technology Licensing, LLC | Real-time radiosity system in a video game environment |
8487954, | Aug 14 2001 | DIGIMEDIA TECH, LLC | Automatic 3D modeling |
8823705, | Apr 11 2007 | Sovereign Peak Ventures, LLC | Image generating apparatus and image generating method for generating images by rendering a polygon |
8970584, | Jun 24 2011 | Nvidia Corporation | Bounding box-based techniques for improved sample test efficiency in image rendering |
9142043, | Jun 24 2011 | Nvidia Corporation | System and method for improved sample test efficiency in image rendering |
9147270, | Jun 24 2011 | Nvidia Corporation | Bounding plane-based techniques for improved sample test efficiency in image rendering |
9153068, | Jun 24 2011 | Nvidia Corporation | Clipless time and lens bounds for improved sample test efficiency in image rendering |
9159158, | Jul 19 2012 | Nvidia Corporation | Surface classification for point-based rendering within graphics display system |
9171394, | Jul 19 2012 | Nvidia Corporation | Light transport consistent scene simplification within graphics display system |
9269183, | Jul 31 2011 | Nvidia Corporation | Combined clipless time and lens bounds for improved sample test efficiency in image rendering |
9305394, | Jan 27 2012 | Nvidia Corporation | System and process for improved sampling for parallel light transport simulation |
9460546, | Mar 30 2011 | Nvidia Corporation | Hierarchical structure for accelerating ray tracing operations in scene rendering |
Patent | Priority | Assignee | Title |
4275413, | Mar 30 1978 | DAINIPPON SCREEN SEIZO KABUSHIKI KAISHA, 1-1 TENJIN-KITAMACHI, TERANOUCHI-AGARU 4-CHOME, HORIKAWA-DORI, KAMIGYO-KU, KYOTO-SHI,JAPAN A CORP OF JAPAN | Linear interpolator for color correction |
4357624, | May 15 1979 | Combined Logic Company | Interactive video production system |
4388620, | Jan 05 1981 | Atari, Inc. | Method and apparatus for generating elliptical images on a raster-type video display |
4425559, | Jun 02 1980 | Atari Games Corporation | Method and apparatus for generating line segments and polygonal areas on a raster-type display |
4463380, | Sep 25 1981 | Lockheed Martin Corp | Image processing system |
4491836, | Feb 29 1980 | Lockheed Martin Corp | Graphics display system and method including two-dimensional cache |
4570233, | Jul 01 1982 | L-3 Communications Corporation | Modular digital image generator |
4586038, | Dec 12 1983 | Intel Corporation | True-perspective texture/shading processor |
4600919, | Aug 03 1982 | New York Institute of Technology | Three dimensional animation |
4615013, | Aug 02 1983 | L-3 Communications Corporation | Method and apparatus for texture generation |
4625289, | Jan 09 1985 | EVANS & SUTHERLAND COMPUTER CORP , A CORP OF UTAH | Computer graphics system of general surface rendering by exhaustive sampling |
4653012, | Aug 19 1983 | GEC-Marconi Limited | Display systems |
4658247, | Jul 30 1984 | Cornell Research Foundation, Inc. | Pipelined, line buffered real-time color graphics display system |
4692880, | Nov 15 1985 | Intel Corporation | Memory efficient cell texturing for advanced video object generator |
4695943, | Sep 27 1984 | Intel Corporation | Multiprocessor shared pipeline cache memory with split cycle and concurrent utilization |
4710876, | Jun 05 1985 | General Electric Company | System and method for the display of surface structures contained within the interior region of a solid body |
4725831, | Apr 27 1984 | XTAR Corporation | High-speed video graphics system and method for generating solid polygons on a raster display |
4768148, | Jun 27 1986 | Honeywell Bull Inc.; HONEYWELL INFORMATION SYSTEMS INC , A CORP OF DE | Read in process memory apparatus |
4785395, | Jun 27 1986 | Honeywell Bull Inc.; HONEYWELL INFORMATION SYSTEMS INC , A CORP OF DE | Multiprocessor coherent cache system including two level shared cache with separately allocated processor storage locations and inter-level duplicate entry replacement |
4790025, | Dec 07 1984 | Dainippon Screen Mfg. Co., Ltd. | Processing method of image data and system therefor |
4808988, | Apr 13 1984 | Megatek Corporation | Digital vector generator for a graphic display system |
4812988, | Aug 30 1985 | U S PHILIPS CORPORATION, A CORP OF DE | Processor for the elimination of concealed faces for the synthesis of images in three dimensions |
4817175, | Mar 19 1984 | SCHLUMBERGER SYSTEMS AND SERVICES, INC | Video stream processing system |
4829295, | Mar 31 1986 | Namco Ltd. | Image synthesizer |
4829452, | Jul 05 1984 | Xerox Corporation | Small angle image rotation using block transfers |
4833601, | May 28 1987 | Bull HN Information Systems Inc.; HONEYWELL BULL INC , 3800 WEST 80TH ST , MINNEAPOLIS, MN 55431 A CORP OF DE | Cache resiliency in processing a variety of address faults |
4855934, | Oct 03 1986 | Rockwell Collins Simulation And Training Solutions LLC | System for texturing computer graphics images |
4862392, | Mar 07 1986 | STAR TECHNOLOGIES, INC , A CORP OF DE | Geometry processor for graphics display system |
4866637, | Oct 30 1987 | International Business Machines Corporation; INTERNATIONAL BUSINESS MACHINES CORPORATION, ARMONK, NEW YORK 10504 A CORP OF NEW YORK | Pipelined lighting model processing system for a graphics workstation's shading function |
4888712, | Nov 04 1987 | APPLICON, INC | Guardband clipping method and apparatus for 3-D graphics display system |
4897806, | Jun 19 1985 | Pixar | Pseudo-random point sampling techniques in computer graphics |
4901064, | Nov 04 1987 | APPLICON, INC | Normal vector shading for 3-D graphics display system |
4907174, | Jun 02 1988 | Sun Microsystems, Inc. | Z-buffer allocated for window identification |
4914729, | Feb 20 1986 | Yamaha Corporation | Method of filling polygonal region in video display system |
4918625, | Dec 19 1986 | L-3 Communications Corporation | Method and apparatus for processing translucent objects |
4935879, | Aug 05 1987 | Daikin Industries, Ltd. | Texture mapping apparatus and method |
4945500, | Nov 04 1987 | APPLICON, INC | Triangle processor for 3-D graphics display system |
4965751, | Aug 18 1987 | Hewlett-Packard Company | Graphics system with programmable tile size and multiplexed pixel data and partial pixel addresses based on tile size |
4974176, | Dec 18 1987 | Intel Corporation | Microtexture for close-in detail |
4974177, | Oct 04 1985 | Daikin Industries Ltd. | Mapping circuit of a CRT display device |
4975977, | Nov 28 1988 | Hitachi, Ltd. | Rotation processing method of image and system therefor |
4989138, | Sep 02 1988 | Xerox Corporation | Single bus graphics data processing pipeline with decentralized bus arbitration |
5003496, | Aug 26 1988 | Eastman Kodak Company | Page memory control in a raster image processor |
5016183, | Sep 13 1988 | Lectra SA | Textile design system and method |
5018076, | Sep 16 1988 | Intel Corporation | Method and circuitry for dual panel displays |
5043922, | Sep 09 1988 | INTERNATIONAL BUSINESS MACHINES CORPORATION A CORPORATION OF NY | Graphics system shadow generation using a depth buffer |
5056044, | Aug 18 1987 | Hewlett-Packard Company | Graphics frame buffer with programmable tile size |
5062057, | Dec 09 1988 | AUTODESK, Inc | Computer display controller with reconfigurable frame buffer memory |
5086495, | Dec 18 1987 | International Business Machines Corporation | Solid modelling system with logic to discard redundant primitives |
5091967, | Apr 08 1988 | Dainippon Screen Mfg. Co., Ltd. | Method of extracting contour of a subject image from an original |
5097427, | Jul 24 1987 | Hewlett-Packard Company | Texture mapping for computer graphics display controller system |
5136664, | Feb 23 1988 | STARDENT COMPUTER INC | Pixel rendering |
5144291, | Nov 02 1987 | MATSUSHITA ELECTRIC INDUSTRIAL CO , LTD , A CORP OF JAPAN | Means for eliminating hidden surface |
5163126, | May 10 1990 | International Business Machines Corporation | Method for adaptively providing near Phong grade shading for patterns in a graphics display system |
5170468, | Aug 18 1987 | Hewlett-Packard Company | Graphics system with shadow ram update to the color map |
5179638, | Apr 26 1990 | Honeywell Inc. | Method and apparatus for generating a texture mapped perspective view |
5204944, | Jul 28 1989 | TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK, THE | Separable image warping methods and systems using spatial lookup tables |
5224208, | Mar 16 1990 | Hewlett-Packard Company | Gradient calculation for texture mapping |
5239624, | Jun 19 1985 | Pixar | Pseudo-random point sampling techniques in computer graphics |
5241658, | Aug 21 1990 | Apple Inc | Apparatus for storing information in and deriving information from a frame buffer |
5255353, | Feb 28 1989 | Ricoh Company, Ltd. | Three-dimensional shadow processor for an image forming apparatus |
5268995, | Nov 21 1990 | RYO HOLDINGS, LLC | Method for executing graphics Z-compare and pixel merge instructions in a data processor |
5268996, | Dec 20 1990 | Intel Corporation | Computer image generation method for determination of total pixel illumination due to plural light sources |
5278948, | Oct 24 1989 | International Business Machines Corporation | Parametric surface evaluation method and apparatus for a computer graphics display system |
5307450, | Feb 19 1991 | Microsoft Technology Licensing, LLC | Z-subdivision for improved texture mapping |
5315692, | Jul 22 1988 | L-3 Communications Corporation | Multiple object pipeline display system |
5345541, | Dec 20 1991 | Apple Inc | Method and apparatus for approximating a value between two endpoint values in a three-dimensional image rendering device |
5353424, | Nov 19 1991 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Fast tag compare and bank select in set associative cache |
5357579, | Sep 03 1991 | Intel Corporation | Multi-layer atmospheric fading in real-time computer image generator |
5361386, | Dec 04 1987 | Nvidia Corporation | System for polygon interpolation using instantaneous values in a variable |
5363475, | Dec 05 1988 | Rediffusion Simulation Limited | Image generator for generating perspective views from data defining a model having opaque and translucent features |
5377313, | Jan 29 1992 | International Business Machines Corporation | Computer graphics display method and system with shadow generation |
5392385, | Dec 10 1987 | International Business Machines Corporation | Parallel rendering of smoothly shaped color triangles with anti-aliased edges for a three dimensional color display |
5392393, | Jun 04 1993 | Sun Microsystems, Inc | Architecture for a high performance three dimensional graphics accelerator |
5394516, | Jun 29 1990 | Qualcomm Incorporated | Generating an image |
5402532, | Mar 12 1991 | International Business Machines Corporation | Direct display of CSG expression by use of depth buffers |
5404445, | Oct 31 1991 | TOSHIBA AMERICA INFORMATION SYSTEMS, INC , A CORP OF CALIFORNIA | External interface for a high performance graphics adapter allowing for graphics compatibility |
5408650, | Jun 29 1993 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Memory analysis system for dynamically displaying memory allocation and de-allocation events associated with an application program |
5412796, | May 12 1990 | Thomson Training & Simulation Limited | Method and apparatus for generating images simulating non-homogeneous fog effects |
5415549, | Mar 21 1991 | WARNER BROS ENTERTAINMENT INC | Method for coloring a polygon on a video display |
5416606, | Dec 21 1989 | Canon Kabushiki Kaisha | Method and apparatus for encoding or decoding an image in accordance with image characteristics |
5421028, | Mar 15 1991 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Processing commands and data in a common pipeline path in a high-speed computer graphics system |
5422997, | Jul 09 1992 | Kabushiki Kaisha Toshiba | Texture address generator, texture pattern generator, texture drawing device, and texture address generating method |
5432895, | Oct 01 1992 | University Corporation for Atmospheric Research | Virtual reality imaging system |
5432900, | Jun 19 1992 | Intel Corporation | Integrated graphics and video computer display system |
5438663, | Apr 30 1992 | Toshiba America Information Systems; Kabushiki Kaisha Toshiba | External interface for a high performance graphics adapter allowing for graphics compatibility |
5448689, | Mar 31 1987 | Hitachi, LTD; HITACHI ENGINEERING CO , LTD | Graphic data processing system |
5457775, | Nov 15 1990 | INTERGRAPH HARDWARE TECHNOLOGIES COMPANY INC | High performance triangle interpolator |
5461712, | Apr 18 1994 | International Business Machines Corporation | Quadrant-based two-dimensional memory manager |
5467438, | Oct 13 1989 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for compensating for color in color images |
5467459, | Aug 13 1991 | Board of Regents of the University of Washington; Samsung Electronics | Imaging and graphics processing system |
5469535, | May 04 1992 | WARNER BROS ENTERTAINMENT INC | Three-dimensional, texture mapping display system |
5473736, | Jun 08 1992 | Silicon Valley Bank | Method and apparatus for ordering and remapping colors in images of real two- and three-dimensional objects |
5475803, | Jul 10 1992 | LSI Logic Corporation | Method for 2-D affine transformation of images |
5487146, | Mar 08 1994 | Texas Instruments Incorporated | Plural memory access address generation employing guide table entries forming linked list |
5490240, | Jul 09 1993 | Microsoft Technology Licensing, LLC | System and method of generating interactive computer graphic images incorporating three dimensional textures |
5495563, | Jan 15 1990 | Qualcomm Incorporated | Apparatus for converting pyramidal texture coordinates into corresponding physical texture memory addresses |
5504499, | Mar 18 1988 | Hitachi, Ltd. | Computer aided color design |
5504917, | Apr 14 1986 | National Instruments Corporation | Method and apparatus for providing picture generation and control features in a graphical data flow environment |
5506604, | Apr 06 1994 | Cirrus Logic, INC | Apparatus, systems and methods for processing video data in conjunction with a multi-format frame buffer |
5535374, | May 12 1990 | Rediffusion Simulation Limited | Method and apparatus for generating images simulating non-homogeneous fog effects |
5543824, | Jun 17 1991 | Sun Microsystems, Inc. | Apparatus for selecting frame buffers for display in a double buffered display system |
5544292, | Jan 15 1990 | U.S. Philips Corporation | Display apparatus having a display processor for storing and filtering two dimensional arrays forming a pyramidal array, and method of operating such an apparatus |
5548709, | Mar 07 1994 | Microsoft Technology Licensing, LLC | Apparatus and method for integrating texture memory and interpolation logic in a computer system |
5553228, | Sep 19 1994 | International Business Machines Corporation | Accelerated interface between processors and hardware adapters |
5557712, | Feb 16 1994 | Apple Inc | Color map tables smoothing in a color computer graphics system avoiding objectionable color shifts |
5559954, | Feb 24 1993 | Intel Corporation | Method & apparatus for displaying pixels from a multi-format frame buffer |
5561746, | Aug 26 1992 | Namco Bandai Games INC | Image synthesizing system with surface data perspective transformation |
5561752, | Dec 22 1994 | Apple Inc | Multipass graphics rendering method and apparatus with re-traverse flag |
5561756, | May 08 1992 | Apple Inc | Textured sphere and spherical environment map rendering using texture map double indirection |
5563989, | Oct 02 1992 | Canon Kabushiki Kaisha | Apparatus and method for performing lighting calculations for surfaces of three-dimensional objects |
5566285, | Nov 22 1993 | KONAMI CO , LTD | Image processing apparatus capable of mapping texture to each polygon of a three dimensional image |
5573402, | May 22 1992 | MIDWAY GAMES WEST INC | System and method for coloring polygon using dithering |
5579456, | Oct 15 1993 | Rockwell Collins Simulation And Training Solutions LLC | Direct rendering of textured height fields |
5586234, | May 15 1992 | Fujitsu Limited | Parallel processing three-dimensional drawing apparatus for simultaneously mapping a plurality of texture patterns |
5593350, | Nov 04 1994 | GUILLEMOT CORPORATION, A FRENCH SOCIETE ANONYME | Video game card having interrupt resistant behavior |
5594854, | Mar 24 1995 | ZIILABS INC , LTD | Graphics subsystem with coarse subpixel correction |
5600763, | Jul 21 1994 | Apple Inc | Error-bounded antialiased rendering of complex scenes |
5606650, | Apr 22 1993 | Apple Inc | Method and apparatus for storage and retrieval of a texture map in a graphics display system |
5607157, | Apr 09 1993 | Sega Enterprises, Ltd. | Multi-connection device for use in game apparatus |
5608424, | Feb 05 1990 | Nintendo Co., Ltd.; Ricoh Co., Ltd | Moving picture display apparatus and external memory used therefor |
5608864, | Apr 29 1994 | S3 GRAPHICS CO , LTD | Variable pixel depth and format for video windows |
5616031, | Mar 21 1991 | WARNER BROS ENTERTAINMENT INC | System and method of shadowing an object in motion |
5621867, | Aug 26 1992 | Namco Bandai Games INC | Image synthesizing system |
5628686, | Jul 31 1995 | Microsoft Technology Licensing, LLC | Apparatus and method for bidirectional data communication in a game port |
5638535, | May 15 1995 | Nvidia Corporation | Method and apparatus for providing flow control with lying for input/output operations in a computer system |
5644364, | Apr 16 1993 | Avid Technology, Inc. | Media pipeline with multichannel video processing and playback |
5649082, | Mar 20 1995 | Microsoft Technology Licensing, LLC | Efficient method and apparatus for determining texture coordinates for lines and polygons |
5650955, | Jun 20 1994 | Intellectual Ventures I LLC | Graphics controller integrated circuit without memory interface |
5651104, | Apr 25 1995 | Nvidia Corporation | Computer graphics system and process for adaptive supersampling |
5657045, | Dec 26 1983 | Hitachi, Ltd.; Hitachi Engineering Co., Ltd. | Graphic pattern processing apparatus |
5657443, | May 16 1995 | Hewlett-Packard Company | Enhanced test system for an application-specific memory scheme |
5657478, | May 16 1996 | Round Rock Research, LLC | Method and apparatus for batchable frame switch and synchronization operations |
5659671, | Sep 30 1992 | GLOBALFOUNDRIES Inc | Method and apparatus for shading graphical images in a data processing system |
5659673, | Dec 16 1988 | Canon Kabushiki Kaisha | Image processing apparatus |
5659715, | Nov 30 1993 | VLSI Technology, Inc. | Method and apparatus for allocating display memory and main memory employing access request arbitration and buffer control |
5664162, | May 23 1994 | Nvidia Corporation | Graphics accelerator with dual memory controllers |
5666439, | May 27 1993 | Canon Kabushiki Kaisha | Outline discrimination and processing |
5678037, | Sep 16 1994 | VLSI Technology, Inc. | Hardware graphics accelerator system and method therefor |
5682522, | Jul 18 1995 | XGI TECHNOLOGY INC | Shared memory architecture of graphics frame buffer and hard disk cache |
5684941, | Sep 01 1994 | Nvidia Corporation | Interpolation rendering of polygons into a pixel grid |
5687304, | Feb 14 1994 | Parametric Technology Corporation | Real-time image generation system for simulating physical paint, drawing media, and feature modeling with 3-D graphics |
5687357, | Apr 14 1995 | Nvidia Corporation | Register array for utilizing burst mode transfer on local bus |
5691746, | Oct 28 1994 | Winbond Electronics Corp. | Digital video format conversion by upsampling decompressed data using on-the-fly interpolation and color conversion |
5694143, | Jun 02 1994 | Mosaid Technologies Incorporated | Single chip frame buffer and graphics accelerator |
5696892, | Jul 10 1992 | DISNEY ENTERPRISES, INC | Method and apparatus for providing animation in a three-dimensional computer generated virtual world using a succession of textures derived from temporally related source images |
5701444, | Mar 24 1995 | ZIILABS INC , LTD | Three-dimensional graphics subsystem with enhanced support for graphical user interface |
5703806, | Jun 20 1994 | Intellectual Ventures I LLC | Graphics controller integrated circuit without memory interface |
5706481, | Mar 07 1994 | Microsoft Technology Licensing, LLC | Apparatus and method for integrating texture memory and interpolation logic in a computer system |
5706482, | May 31 1995 | HTC Corporation | Memory access controller |
5714981, | Apr 21 1995 | ADVANCED GRAVIS COMPUTER TECHNOLOGY, LTD | Gameport communication apparatus and method |
5721947, | May 15 1995 | CORILLI CAPITAL LIMITED LIABILITY COMPANY | Apparatus adapted to be joined between the system I/O bus and I/O devices which translates addresses furnished directly by an application program |
5724561, | Nov 03 1995 | Nvidia Corporation | System and method for efficiently determining a fog blend value in processing graphical images |
5726689, | Oct 28 1994 | Mitsubishi Denki Kabushiki Kaisha | Mapping apparatus and method |
5726947, | Jul 14 1995 | Renesas Electronics Corporation | Synchronous semiconductor memory device suitable for graphic data processing |
5727192, | Mar 24 1995 | ZIILABS INC , LTD | Serial rendering system with auto-synchronization on frame blanking |
5734386, | Sep 08 1995 | Rockwell Collins Simulation And Training Solutions LLC | System and method for displaying textured polygons using planar texture interpolation |
5739819, | Feb 05 1996 | CreoScitex Corporation Ltd | Method and apparatus for generating an artificial shadow in a two dimensional color image |
5740343, | Nov 03 1995 | Nvidia Corporation | Texture compositing apparatus and method |
5740383, | Dec 22 1995 | Nvidia Corporation | Dynamic arbitration priority |
5740406, | May 15 1995 | Nvidia Corporation | Method and apparatus for providing fifo buffer input to an input/output device used in a computer system |
5742749, | Jul 09 1993 | Microsoft Technology Licensing, LLC | Method and apparatus for shadow generation through depth mapping |
5742788, | Jul 26 1991 | Sun Microsystems, Inc. | Method and apparatus for providing a configurable display memory for single buffered and double buffered application programs to be run singly or simultaneously |
5745118, | Jun 06 1995 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | 3D bypass for download of textures |
5745125, | Jul 02 1996 | Oracle America, Inc | Floating point processor for a three-dimensional graphics accelerator which includes floating point, lighting and set-up cores for improved performance |
5748199, | Dec 20 1995 | TAMIRAS PER PTE LTD , LLC | Method and apparatus for converting a two dimensional motion picture into a three dimensional motion picture |
5748986, | Aug 08 1990 | Kyocera Mita Corporation | Method and apparatus for displaying a page with graphics information on a continuous synchronous raster output device |
5751291, | Jul 26 1996 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | System and method for accelerated occlusion culling |
5751292, | Jun 06 1995 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Texture mapping method and system |
5751295, | Apr 27 1995 | Control Systems, Inc.; CONTROL SYSTEMS, INC | Graphics accelerator chip and method |
5751930, | Sep 13 1985 | Hitachi, Ltd.; Hitachi Engineering Co., Ltd. | Graphic processing system |
5754191, | Dec 22 1995 | Nvidia Corporation | Method and apparatus for optimizing pixel data write operations to a tile based frame buffer |
5757382, | Dec 29 1994 | QUARTERHILL INC ; WI-LAN INC | Apparatus for tracing contours of segmented regions |
5758182, | May 15 1995 | CORILLI CAPITAL LIMITED LIABILITY COMPANY | DMA controller translates virtual I/O device address received directly from application program command to physical i/o device address of I/O device on device bus |
5760783, | Nov 06 1995 | Microsoft Technology Licensing, LLC | Method and system for providing texture using a selected portion of a texture map |
5764228, | Mar 24 1995 | ZIILABS INC , LTD | Graphics pre-processing and rendering system |
5764237, | Oct 07 1994 | Yamaha Corporation | Texture mapping apparatus computing texture address by fill address |
5764243, | Mar 24 1995 | ZIILABS INC , LTD | Rendering architecture with selectable processing of multi-pixel spans |
5767856, | Aug 22 1995 | Round Rock Research, LLC | Pixel engine pipeline for a 3D graphics accelerator |
5767858, | Dec 01 1994 | Nvidia Corporation | Computer graphics system with texture mapping |
5768626, | Jun 24 1994 | Intel Corporation | Method and apparatus for servicing a plurality of FIFO's in a capture gate array |
5768629, | Jun 24 1993 | TALON RESEARCH, LLC | Token-based adaptive video processing arrangement |
5774133, | Jan 09 1991 | ZIILABS INC LTD , A CORPORATION ORGANIZED UNDER THE LAWS OF BERMUDA | Computer system with improved pixel processing capabilities |
5777623, | Feb 15 1996 | Canon Kabushiki Kaisha | Apparatus and method for performing perspectively correct interpolation in computer graphics in a variable direction along a line of pixels |
5777629, | Mar 24 1995 | ZIILABS INC , LTD | Graphics subsystem with smart direct-memory-access operation |
5781927, | Jan 30 1996 | United Microelectronics Corporation | Main memory arbitration with priority scheduling capability including multiple priorty signal connections |
5791994, | Jun 01 1994 | SONY NETWORK ENTERTAINMENT PLATFORM INC ; Sony Computer Entertainment Inc | Video signal reproducing apparatus |
5798770, | Mar 24 1995 | ZIILABS INC , LTD | Graphics rendering system with reconfigurable pipeline sequence |
5801706, | Apr 22 1994 | Hitachi, Ltd. | Special purpose memory for graphics and display apparatus using the special purpose memory for graphics |
5801711, | Aug 08 1995 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Polyline and triangle strip data management techniques for enhancing performance of computer graphics system |
5801716, | Aug 16 1990 | Canon Kabushiki Kaisha | Pipeline structures for full-color computer graphics |
5801720, | Feb 20 1996 | Advanced Micro Devices, INC | Data transfer from a graphics subsystem to system memory |
5805175, | Apr 14 1995 | Nvidia Corporation | Method and apparatus for providing a plurality of color formats from a single frame buffer |
5805868, | Mar 24 1995 | ZIILABS INC , LTD | Graphics subsystem with fast clear capability |
5808619, | Nov 09 1995 | Samsung Electronics Co., Ltd. | Real-time rendering method of selectively performing bump mapping and phong shading processes and apparatus therefor |
5808630, | Nov 03 1995 | PMC-SIERRA, INC | Split video architecture for personal computers |
5809219, | Apr 15 1996 | AUTODESK CANADA CO | Analytic motion blur coverage in the generation of computer graphics imagery |
5809278, | Dec 28 1993 | Kabushiki Kaisha Toshiba | Circuit for controlling access to a common memory based on priority |
5815165, | Jan 10 1990 | ATHENS BLUESTONE LLC | Graphics processor |
5815166, | Mar 24 1995 | ZIILABS INC , LTD | Graphics subsystem with slaveable rasterizer |
5818456, | Apr 30 1996 | Rockwell Collins Simulation And Training Solutions LLC | Computer graphics system with adaptive pixel multisampler |
5819017, | Aug 22 1995 | Microsoft Technology Licensing, LLC | Apparatus and method for selectively storing depth information of a 3-D image |
5821940, | Aug 03 1992 | Ball Aerospace & Technologies Corp | Computer graphics vertex index cache system for polygons |
5821949, | Jul 01 1996 | Oracle America, Inc | Three-dimensional graphics accelerator with direct data channels for improved performance |
5822516, | May 16 1995 | Hewlett-Packard Company | Enhanced test method for an application-specific memory scheme |
5828382, | Aug 02 1996 | Nvidia Corporation | Apparatus for dynamic XY tiled texture caching |
5828383, | Dec 21 1995 | S3 GRAPHICS CO , LTD | Controller for processing different pixel data types stored in the same display memory by use of tag bits |
5828907, | Jun 24 1993 | TALON RESEARCH, LLC | Token-based adaptive video processing arrangement |
5831624, | Apr 30 1996 | Nvidia Corporation | Level of detail texture filtering with dithering and mipmaps |
5831625, | Jun 10 1996 | Rambus Inc | Wavelet texturing |
5831640, | Dec 20 1996 | Nvidia Corporation | Enhanced texture map data fetching circuit and method |
5835096, | Mar 24 1995 | ZIILABS INC , LTD | Rendering system using 3D texture-processing hardware for accelerated 2D rendering |
5835792, | Jun 24 1993 | TALON RESEARCH, LLC | Token-based adaptive video processing arrangement |
5838334, | Nov 16 1994 | Intellectual Ventures I LLC | Memory and graphics controller which performs pointer-based display list video refresh operations |
5844576, | Dec 30 1996 | HANGER SOLUTIONS, LLC | Tiled linear host texture storage |
5850229, | Dec 15 1995 | 3D Systems, Inc | Apparatus and method for geometric morphing |
5852451, | Jan 09 1997 | S3 GRAPHICS CO , LTD | Pixel reordering for improved texture mapping |
5856829, | May 10 1995 | SAMSUNG ELECTRONICS CO , LTD | Inverse Z-buffer and video display system having list-based control mechanism for time-deferred instructing of 3D rendering engine that also responds to supervisory immediate commands |
5859645, | Mar 26 1993 | Lockheed Martin Corporation | Method for point sampling in computer graphics systems |
5861888, | Nov 27 1996 | VLSI TECHNOLOGY, IND ; VLSI Technology, Inc | Method and a system for the nonlinear storage of a texture map within a linear memory device |
5861893, | May 27 1997 | Intel Corporation | System and method for graphics data concurrency and coherency |
5867166, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Method and system for generating images using Gsprites |
5870097, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Method and system for improving shadowing in a graphics rendering system |
5870098, | Feb 26 1997 | Evans & Sutherland Computer Corporation | Method for rendering shadows on a graphical display |
5870102, | Nov 03 1995 | Nvidia Corporation | Texture compositing apparatus and method |
5870109, | Jun 06 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Graphic system with read/write overlap detector |
5870587, | Mar 20 1996 | International Business Machines Corporation | Information-handling system, method, and article of manufacture including a mechanism for providing an improved application binary interface |
5872902, | May 28 1993 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Method and apparatus for rendering of fractional pixel lists for anti-aliasing and transparency |
5874969, | Jul 01 1996 | Oracle America, Inc | Three-dimensional graphics accelerator which implements multiple logical buses using common data lines for improved bus communication |
5877741, | Jun 07 1995 | Seiko Epson Corporation | System and method for implementing an overlay pathway |
5877770, | May 24 1995 | Sharp Kabushiki Kaisha | Texture pattern memory circuit for providing plural texel data in response to a single access operation |
5877771, | Jul 12 1996 | Microsoft Technology Licensing, LLC | Method and apparatus for supersampling based on the local rate of change in texture |
5880736, | Feb 28 1997 | Microsoft Technology Licensing, LLC | Method system and computer program product for shading |
5880737, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Method and system for accessing texture data in environments with high latency in a graphics rendering system |
5883638, | Dec 01 1995 | Lucasfilm Entertainment Company Ltd | Method and apparatus for creating lifelike digital representations of computer animated objects by providing corrective enveloping |
5886701, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Graphics rendering device and method for operating same |
5886705, | May 17 1996 | Seiko Epson Corporation | Texture memory organization based on data locality |
5887155, | Jul 25 1996 | ASML NETHERLANDS B V | Vertex based geometry engine system for use in integrated circuit design |
5890190, | Dec 31 1992 | Intel Corporation | Frame buffer for storing graphics and video data |
5892517, | Jun 10 1996 | Rambus Inc | Shared access texturing of computer graphic images |
5892974, | Oct 12 1994 | Sega Enterprises Ltd. | System for sub-data processor identifies the peripheral from supplied identification data and supplies data indicative of the kind of peripheral to main data processor |
5894300, | Sep 28 1995 | NEC Corporation | Color image display apparatus and method therefor |
5900881, | Mar 22 1995 | DIGITAL MEDIA PROFESSIONALS INC | Computer graphics circuit |
5903283, | Aug 27 1997 | Intel Corporation | Video memory controller with dynamic bus arbitration |
5909218, | Apr 25 1996 | Panasonic Intellectual Property Corporation of America | Transmitter-receiver of three-dimensional skeleton structure motions and method thereof |
5909225, | May 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Frame buffer cache for graphics applications |
5912675, | Dec 19 1996 | AUTODESK, Inc | System and method using bounding volumes for assigning vertices of envelopes to skeleton elements in an animation system |
5912676, | Jun 14 1996 | AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD | MPEG decoder frame memory interface which is reconfigurable for different frame store architectures |
5914721, | Jun 28 1991 | FUZZYSHARP TECHNOLOGIES INC | Visibility calculations for 3D computer graphics |
5914725, | Mar 07 1996 | TECH 5 SAS | Interpolation of pixel values and alpha values in a computer graphics display device |
5914729, | Apr 17 1992 | Intel Corporation | Visual frame buffer architecture |
5917496, | Apr 22 1994 | Hitachi, Ltd. | Special purpose memory for graphics and display apparatus using the same |
5920326, | May 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Caching and coherency control of multiple geometry accelerators in a computer graphics system |
5920876, | Apr 23 1997 | Oracle America, Inc | Performing exact garbage collection using bitmaps that identify pointer values within objects |
5923332, | Jul 10 1995 | Ricoh Company, Ltd. | Image processing device |
5923334, | Sep 27 1996 | International Business Machines Corporation | Polyhedral environment map utilizing a triangular data structure |
5926182, | Nov 19 1996 | Nvidia Corporation | Efficient rendering utilizing user defined shields and windows |
5926647, | Oct 11 1996 | AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD | Processing system with dynamic alteration of a color look-up table |
5933150, | Aug 06 1996 | Vulcan Patents LLC | System for image manipulation and animation using embedded constraint graphics |
5933154, | Sep 30 1994 | Apple Computer, Inc.; Apple Computer, Inc | Multi-panel video display control addressing of interleaved frame buffers via CPU address conversion |
5933155, | Nov 06 1996 | LG ELECTRONICS, INC | System and method for buffering multiple frames while controlling latency |
5933529, | Dec 24 1996 | QUARTERHILL INC ; WI-LAN INC | Method of tracing a contour of an object based on background information of the object |
5936641, | Jun 27 1997 | Apple Inc | Graphics hardware acceleration method, computer program, and system |
5940086, | Jan 10 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | System and method for dynamically allocating data among geometry accelerators in a computer graphics system |
5940089, | Nov 13 1995 | ATI Technologies, Inc | Method and apparatus for displaying multiple windows on a display monitor |
5940538, | Aug 04 1995 | Apparatus and methods for object border tracking | |
5943058, | Jan 25 1996 | Microsoft Technology Licensing, LLC | Texture mapping circuit for performing data interpolations |
5943060, | Apr 30 1996 | Rockwell Collins Simulation And Training Solutions LLC | Computer graphics system with adaptive pixel multisampler |
5945997, | Jun 26 1997 | S3 GRAPHICS CO , LTD | Block- and band-oriented traversal in three-dimensional triangle rendering |
5949421, | Mar 31 1997 | Nvidia Corporation | Method and system for efficient register sorting for three dimensional graphics |
5949423, | Sep 30 1997 | Hewlett-Packard Company | Z buffer with degree of visibility test |
5949424, | Feb 28 1997 | Microsoft Technology Licensing, LLC | Method, system, and computer program product for bump mapping in tangent space |
5949428, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Method and apparatus for resolving pixel data in a graphics rendering system |
5949440, | Apr 30 1996 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Method and apparatus for processing graphics primitives in multiple modes using reconfigurable hardware |
5956042, | Apr 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Graphics accelerator with improved lighting processor |
5956043, | Sep 18 1997 | RPX Corporation | Textured tile rotation system and method |
5958020, | Oct 29 1997 | VLSI Technology, Inc. | Real time event determination in a universal serial bus system |
5959640, | Jan 13 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Display controllers |
5963220, | Feb 08 1996 | MEDIATEK INC | Mip map/rip map texture linear addressing memory organization and address generator |
5963683, | Aug 25 1995 | The United States of America as represented by the Administrator of the | Photonic switching devices using light bullets |
5966134, | Jun 28 1996 | AUTODESK, Inc | Simulating cel animation and shading |
5969726, | May 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Caching and coherency control of multiple geometry accelerators in a computer graphics system |
5977979, | Oct 31 1995 | ACTIVISION PUBLISHING, INC | Simulated three-dimensional display using bit-mapped information |
5977984, | Dec 24 1996 | Sony Corporation | Rendering apparatus and method |
5982376, | Feb 14 1995 | Hitachi, Ltd. | Three-dimensional graphic display apparatus with improved high-speed anti-aliasing |
5982390, | Mar 25 1996 | Stan, Stoneking | Controlling personality manifestations by objects in a computer-assisted animation environment |
5986659, | Nov 02 1994 | U.S. Philips Corporation | Blurring for computer graphics generated images |
5986663, | Oct 10 1997 | Nvidia Corporation | Auto level of detail-based MIP mapping in a graphics processor |
5986677, | Sep 30 1997 | Hewlett Packard Enterprise Development LP | Accelerated graphics port read transaction merging |
5987567, | Sep 30 1996 | Apple Computer, Inc | System and method for caching texture map information |
5990903, | Feb 03 1997 | Round Rock Research, LLC | Method and apparatus for performing chroma key, transparency and fog operations |
5995120, | Nov 16 1994 | Intellectual Ventures I LLC | Graphics system including a virtual frame buffer which stores video/pixel data in a plurality of memory areas |
5995121, | Oct 16 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Multiple graphics pipeline integration with a windowing system through the use of a high speed interconnect to the frame buffer |
5999189, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Image compression to reduce pixel and texture memory requirements in a real-time image generator |
5999196, | Jul 01 1996 | Sun Microsystems, Inc. | System and method for data multiplexing within geometry processing units of a three-dimensional graphics accelerator |
5999198, | May 09 1997 | Hewlett Packard Enterprise Development LP | Graphics address remapping table entry feature flags for customizing the operation of memory pages associated with an accelerated graphics port device |
6002407, | Dec 16 1997 | CSR TECHNOLOGY INC | Cache memory and method for use in generating computer graphics texture |
6002409, | Oct 29 1997 | Nvidia Corporation | Arbitration for shared graphics processing resources |
6002410, | Aug 25 1997 | ATI Technologies ULC | Reconfigurable texture cache |
6005582, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Method and system for texture mapping images with anisotropic filtering |
6005583, | Apr 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Precise gradient calculation system and method for a texture mapping system of a computer graphics system |
6005584, | Dec 17 1996 | Sega Enterprises, Ltd. | Method of blending a plurality of pixels on a texture map and a plural pixel blending circuit and image processing device using the same |
6007428, | Oct 09 1995 | Nintendo Co., Ltd. | Operation controlling device and video processing system used therewith |
6008820, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Processor for controlling the display of rendered image layers and method for controlling same |
6011562, | Aug 01 1997 | AUTODESK, Inc | Method and system employing an NLE to create and modify 3D animations by mixing and compositing animation data |
6011565, | Apr 09 1998 | S3 GRAPHICS CO , LTD | Non-stalled requesting texture cache |
6014144, | Feb 03 1998 | Oracle America, Inc | Rapid computation of local eye vectors in a fixed point lighting unit |
6016150, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Sprite compositor and method for performing lighting and shading operations using a compositor to combine factored image layers |
6016151, | Sep 12 1997 | TUMBLEWEED HOLDINGS LLC | 3D triangle rendering by texture hardware and color software using simultaneous triangle-walking and interpolation for parallel operation |
6018350, | Oct 29 1996 | Intel Corporation | Illumination and shadow simulation in a computer graphics/imaging system |
6020931, | Apr 25 1996 | GEORGE S SHENG | Video composition and position system and media signal communication system |
6021417, | Oct 31 1997 | Foto Fantasy, Inc. | Method of stimulating the creation of an artist's drawing or painting, and device for accomplishing same |
6022274, | Nov 22 1995 | NINTENDO CO , LTD | Video game system using memory module |
6023261, | Apr 01 1997 | KONAMI CO , LTD | Translucent-image display apparatus, translucent-image display method, and pre-recorded and computer-readable storage medium |
6023738, | Mar 30 1998 | Nvidia Corporation | Method and apparatus for accelerating the transfer of graphical images |
6025853, | Mar 24 1995 | ZIILABS INC , LTD | Integrated graphics subsystem with message-passing architecture |
6026182, | Jun 04 1996 | Microsoft Technology Licensing, LLC | Feature segmentation |
6028608, | Dec 20 1996 | HANGER SOLUTIONS, LLC | System and method of perception-based image generation and encoding |
6028611, | Aug 29 1996 | Apple Inc | Modular digital image processing via an image processing chain |
6031542, | Feb 12 1996 | GMD FORSCHUNGSZENTRUM INFORMATIONSTECHNIK E V & CO KG; FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E V | Image processing method and arrangement for the display of reflective objects |
6035360, | Oct 29 1997 | International Business Machines Corporation; IBM Corporation | Multi-port SRAM access control using time division multiplexed arbitration |
6037948, | Mar 07 1997 | AUTODESK CANADA CO | Method, system, and computer program product for updating texture with overscan |
6037949, | Aug 04 1997 | Pixar; Pixar Animation Studios | Texture mapping and other uses of scalar fields on subdivision surfaces in computer graphics and animation |
6038031, | Jul 28 1997 | RPX Corporation | 3D graphics object copying with reduced edge artifacts |
6038348, | Jul 24 1996 | CSR TECHNOLOGY INC | Pixel image enhancement system and method |
6040843, | Oct 19 1995 | Sparta, Inc. | System for transmission and recovery of digital data using video graphics display processor and method of operation thereof |
6040844, | Jul 31 1996 | Sony Corporation | Apparatus and method for storing and accessing picture generation data |
6041010, | Jun 20 1994 | Intellectual Ventures I LLC | Graphics controller integrated circuit without memory interface pins and associated power dissipation |
6043804, | Mar 21 1997 | SHARED MEMORY GRAPHICS LLC | Color pixel format conversion incorporating color look-up table and post look-up arithmetic operation |
6043821, | Jun 30 1997 | ATI Technologies ULC | Method and apparatus for rendering pixel information from blended texture maps |
6046746, | Jul 01 1996 | Oracle America, Inc | Method and apparatus implementing high resolution rendition of Z-buffered primitives |
6046747, | Aug 04 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Graphics application programming interface avoiding repetitive transfer of texture mapping data |
6046752, | Dec 05 1996 | RPX Corporation | Peer-to-peer parallel processing graphics accelerator |
6049337, | Nov 21 1996 | U S PHILIPS CORPORATION | Method and apparatus for adjusting relative offsets between texture maps dependent upon viewpoint |
6049338, | Apr 01 1998 | AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LIMITED | Spatial filter for surface texture navigation |
6052125, | Jan 07 1998 | Rockwell Collins Simulation And Training Solutions LLC | Method for reducing the rendering load for high depth complexity scenes on a computer graphics display |
6052126, | May 15 1992 | Fujitsu Limited | Parallel processing three-dimensional drawing apparatus for simultaneously mapping a plurality of texture patterns |
6052127, | Dec 30 1996 | Nvidia Corporation | Circuit for determining non-homogenous second order perspective texture mapping coordinates using linear interpolation |
6052129, | Oct 01 1997 | GOOGLE LLC | Method and apparatus for deferred clipping of polygons |
6052133, | Jun 27 1997 | S3 GRAPHICS CO , LTD | Multi-function controller and method for a computer graphics display system |
6054993, | Sep 17 1997 | Nvidia Corporation | Chroma-keyed specular texture mapping in a graphics processor |
6054999, | Mar 22 1988 | Method and apparatus for computer supported animation | |
6057847, | Dec 20 1996 | HANGER SOLUTIONS, LLC | System and method of image generation and encoding using primitive reprojection |
6057849, | Sep 13 1996 | GSF-Forschungszentrum fuer Umwelt und Gesundheit GmbH | Method of displaying geometric object surfaces |
6057851, | Oct 06 1995 | International Business Machines Corp. | Computer graphics system having efficient texture mapping with perspective correction |
6057852, | Apr 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Graphics accelerator with constant color identifier |
6057859, | Mar 31 1997 | SOVOZ, INC | Limb coordination system for interactive computer animation of articulated characters with blended motion data |
6057861, | Feb 08 1996 | MEDIATEK INC | Mip map/rip map texture linear addressing memory organization and address generator |
6057862, | Jul 01 1997 | FOOTHILLS IP LLC | Computer system having a common display memory and main memory |
6057863, | Oct 31 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Dual purpose apparatus, method and system for accelerated graphics port and fibre channel arbitrated loop interfaces |
6061462, | Mar 07 1997 | PHOENIX LICENSING, INC | Digital cartoon and animation process |
6064392, | Mar 16 1998 | CSR TECHNOLOGY INC | Method and apparatus for generating non-homogenous fog |
6067098, | Nov 16 1994 | Intellectual Ventures I LLC | Video/graphics controller which performs pointer-based display list video refresh operation |
6070204, | Jan 06 1998 | Intel Corporation | Method and apparatus for using universal serial bus keyboard to control DOS operations |
6072496, | Jun 08 1998 | Microsoft Technology Licensing, LLC | Method and system for capturing and representing 3D geometry, color and shading of facial expressions and other animated objects |
6075543, | Nov 06 1996 | LG ELECTRONICS, INC | System and method for buffering multiple frames while controlling latency |
6075546, | Nov 10 1997 | Microsoft Technology Licensing, LLC | Packetized command interface to graphics processor |
6078311, | Mar 26 1996 | Pacific Digital Peripherals, Inc. | Joystick game adapter card for a personal computer |
6078333, | Feb 21 1997 | GMD FORSCHUNGSZENTRUM INFORMATIONSTECHNIK E V & CO KG; FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E V | Images and apparatus for carrying out the method |
6078334, | Apr 23 1997 | Sharp Kabushiki Kaisha | 3-D texture mapping processor and 3-D image rendering system using the same |
6078338, | Mar 11 1998 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Accelerated graphics port programmable memory access arbiter |
6081274, | Sep 02 1996 | Ricoh Company, Ltd. | Shading processing device |
6088035, | Aug 16 1996 | OPTITEX LTD ; Mental Images GmbH | Method for displaying a graphic model |
6088042, | Mar 31 1997 | SOVOZ, INC | Interactive motion data animation system |
6088487, | Nov 11 1995 | Sony Corporation | Apparatus and method for changing a video image to a drawing-style image |
6088701, | Nov 14 1997 | Nvidia Corporation | Command data transport to a graphics processing device from a CPU performing write reordering operations |
6091431, | Dec 18 1997 | Intel Corporation | Method and apparatus for improving processor to graphics device local memory performance |
6092124, | Apr 17 1998 | Nvidia Corporation | Method and apparatus for accelerating the rendering of images |
6092158, | Jun 13 1997 | Intel Corporation | Method and apparatus for arbitrating between command streams |
6094200, | Feb 06 1998 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | System and method for accelerated occlusion culling |
6097435, | Jan 31 1997 | Hughes Electronics Corporation | Video system with selectable bit rate reduction |
6097437, | Dec 18 1996 | SAMSUNG ELECTRONICS CO , LTD | Format converter |
6104415, | Mar 26 1998 | Microsoft Technology Licensing, LLC | Method for accelerating minified textured cache access |
6104417, | Sep 13 1996 | Microsoft Technology Licensing, LLC | Unified memory computer architecture with dynamic graphics memory allocation |
6105094, | Jan 26 1998 | QUARTERHILL INC ; WI-LAN INC | Method and apparatus for allocating exclusive shared resource requests in a computer system |
6108743, | Feb 10 1998 | U S BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT | Technique for performing DMA including arbitration between a chained low priority DMA and high priority DMA occurring between two links in the chained low priority |
6111582, | Dec 20 1996 | HANGER SOLUTIONS, LLC | System and method of image generation and encoding using primitive reprojection |
6111584, | Dec 18 1995 | RPX Corporation | Rendering system with mini-patch retrieval from local texture storage |
6115047, | Jul 01 1996 | Oracle America, Inc | Method and apparatus for implementing efficient floating point Z-buffering |
6115049, | Sep 30 1996 | Apple Inc | Method and apparatus for high performance antialiasing which minimizes per pixel storage and object data bandwidth |
6118462, | Jul 01 1997 | FOOTHILLS IP LLC | Computer system controller having internal memory and external memory control |
6128026, | May 04 1998 | S3 GRAPHICS CO , LTD | Double buffered graphics and video accelerator having a write blocking memory interface and method of doing the same |
6144365, | Apr 15 1998 | S3 GRAPHICS CO , LTD | System and method for performing blending using an over sampling buffer |
6144387, | Apr 03 1998 | Microsoft Technology Licensing, LLC | Guard region and hither plane vertex modification for graphics rendering |
6151602, | Mar 25 1998 | JPMORGAN CHASE BANK, N A , AS SUCCESSOR AGENT | Database system with methods providing a platform-independent self-describing data packet for transmitting information |
6155926, | Nov 22 1995 | NINTENDO CO , LTD | Video game system and method with enhanced three-dimensional character and background control |
6157387, | Jun 02 1997 | Nippon Telegraph and Telephone Corporation | Image generating apparatus and method |
6163319, | Feb 28 1997 | Microsoft Technology Licensing, LLC | Method, system, and computer program product for shading |
6166748, | Nov 22 1995 | RPX Corporation | Interface for a high performance low cost video game system with coprocessor providing high speed efficient 3D graphics and digital audio signal processing |
6172678, | Jul 04 1995 | Ricoh Company, Ltd. | Image processing method and apparatus including hidden surface removal |
6173367, | May 19 1999 | ATI Technologies ULC | Method and apparatus for accessing graphics cache memory |
6177944, | Sep 18 1998 | Nvidia Corporation | Two phase rendering for computer graphics |
6181352, | Mar 22 1999 | Nvidia Corporation | Graphics pipeline selectively providing multiple pixels or multiple textures |
6191794, | Apr 08 1998 | Nvidia Corporation | Method and apparatus for scaling texture maps for graphical images |
6198488, | Dec 06 1999 | NVidia | Transform, lighting and rasterization system embodied on a single semiconductor platform |
6200253, | Oct 09 1995 | Nintendo Co., Ltd. | Controller pack |
6204851, | Apr 04 1997 | Intergraph Hardware Technologies Company | Apparatus and method for applying effects to graphical images |
6215496, | Jul 23 1998 | Microsoft Technology Licensing, LLC | Sprites with depth |
6215497, | Aug 12 1998 | MOSYS, INC | Method and apparatus for maximizing the random access bandwidth of a multi-bank DRAM in a computer graphics system |
6226012, | Apr 02 1998 | Nvidia Corporation | Method and apparatus for accelerating the rendering of graphical images |
6226713, | Jan 21 1998 | Oracle America, Inc | Apparatus and method for queueing structures in a multi-level non-blocking cache subsystem |
6229553, | Aug 20 1998 | Apple Inc | Deferred shading graphics pipeline processor |
6232981, | Mar 26 1998 | Microsoft Technology Licensing, LLC | Method for improving texture locality for pixel quads by diagonal level-of-detail calculation |
6236413, | Aug 14 1998 | Microsoft Technology Licensing, LLC | Method and system for a RISC graphics pipeline optimized for high clock speeds by using recirculation |
6239810, | Dec 12 1997 | RPX Corporation | High performance low cost video game system with coprocessor providing high speed efficient 3D graphics and digital audio signal processing |
6252610, | May 29 1998 | Microsoft Technology Licensing, LLC | Method and apparatus for efficiently switching state in a graphics pipeline |
6259460, | Mar 26 1998 | Microsoft Technology Licensing, LLC | Method for efficient handling of texture cache misses by recirculation |
6262608, | May 21 1999 | Ceva Services Limited | Delay locked loop with immunity to missing clock edges |
6264558, | Oct 09 1995 | Nintendo Co., Ltd. | Video game system with data transmitting/receiving controller |
6268861, | Aug 25 1998 | Microsoft Technology Licensing, LLC | Volumetric three-dimensional fog rendering technique |
6275235, | Dec 21 1998 | Microsoft Technology Licensing, LLC | High precision texture wrapping method and device |
6285779, | Aug 02 1999 | XGI CAYMAN LTD | Floating-point complementary depth buffer |
6292194, | Aug 04 1995 | Microsoft Technology Licensing, LLC | Image compression method to reduce pixel and texture memory requirements in graphics applications |
6329997, | Dec 04 1998 | Silicon Motion, Inc. | 3-D graphics chip with embedded DRAM buffers |
6331856, | Nov 22 1995 | RPX Corporation | Video game system with coprocessor providing high speed efficient 3D graphics and digital audio signal processing |
6337689, | Apr 03 1999 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Adaptive buffering of computer graphics vertex commands |
6339428, | Jul 16 1999 | ADVANCED SILICON TECHNOLOGIES, LLC | Method and apparatus for compressed texture caching in a video graphics system |
6342892, | Nov 22 1995 | RPX Corporation | Video game system and coprocessor for video game system |
6353438, | Feb 03 1999 | ATI Technologies ULC | Cache organization--direct mapped cache |
6356497, | Jun 20 1994 | Intellectual Ventures I LLC | Graphics controller integrated circuit without memory interface |
6384824, | Jul 07 1999 | Microsoft Technology Licensing, LLC | Method, system and computer program product for multi-pass bump-mapping into an environment map |
6408362, | Jun 24 1999 | International Business Machines Corporation | Data processing system, cache, and method that select a castout victim in response to the latencies of memory copies of cached data |
6411301, | Oct 28 1999 | Nintendo Co., Ltd. | Graphics system interface |
6417858, | Dec 23 1998 | Microsoft Technology Licensing, LLC | Processor for geometry transformations and lighting calculations |
6426747, | Jun 04 1999 | Microsoft Technology Licensing, LLC | Optimization of mesh locality for transparent vertex caching |
6437781, | May 30 1997 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Computer graphics system having per pixel fog blending |
6452600, | Oct 28 1999 | NINTENDO CO , LTD | Graphics system interface |
6459429, | Jun 14 1999 | Oracle America, Inc | Segmenting compressed graphics data for parallel decompression and rendering |
6466223, | Mar 24 1999 | Microsoft Technology Licensing, LLC | Method and apparatus for texture memory management |
6469707, | Jan 19 2000 | Nvidia Corporation | Method for efficiently rendering color information for a pixel in a computer system |
6476808, | Oct 14 1999 | S3 GRAPHICS CO , LTD | Token-based buffer system and method for a geometry pipeline in three-dimensional graphics |
6476822, | Aug 30 1999 | Qualcomm Incorporated | Method and apparatus for displaying images |
6496187, | Feb 17 1998 | Oracle America, Inc | Graphics system configured to perform parallel sample to pixel calculation |
6501479, | Jun 21 1999 | ATI Technologies ULC | Multi-format vertex data processing apparatus and method |
6580430, | Aug 23 2000 | NINTENDO CO , LTD | Method and apparatus for providing improved fog effects in a graphics system |
6593923, | May 31 2000 | Nvidia Corporation | System, method and article of manufacture for shadow mapping |
6597363, | Aug 20 1998 | Apple Inc | Graphics processor with deferred shading |
6618048, | Oct 28 1999 | NINTENDO CO , LTD | 3D graphics rendering system for performing Z value clamping in near-Z range to maximize scene resolution of visually important Z components |
6636214, | Aug 23 2000 | NINTENDO CO , LTD | Method and apparatus for dynamically reconfiguring the order of hidden surface processing based on rendering mode |
6639595, | Aug 23 2000 | NINTENDO CO , LTD | Achromatic lighting in a graphics system and method |
6664958, | Aug 23 2000 | NINTENDO CO , LTD | Z-texturing |
6664962, | Aug 23 2000 | NINTENDO CO , LTD | Shadow mapping in a low cost graphics system |
6672963, | Sep 18 2000 | NINTENDO CO , LTD | Software implementation of a handheld video game hardware platform |
6700586, | Aug 23 2000 | NINTENDO CO , LTD | Low cost graphics with stitching processing hardware support for skeletal animation |
6707458, | Aug 23 2000 | NINTENDO CO , LTD | Method and apparatus for texture tiling in a graphics system |
6717577, | Oct 28 1999 | NINTENDO CO , LTD | Vertex cache for 3D computer graphics |
CA2070934, | |||
EP637813, | |||
EP1074945, | |||
EP1075146, | |||
EP1081649, | |||
EP1189172, | |||
JP11053580, | |||
JP11076614, | |||
JP11161819, | |||
JP11203500, | |||
JP11226257, | |||
JP11259671, | |||
JP11259678, | |||
JP2000132704, | |||
JP2000132706, | |||
JP2000149053, | |||
JP2000156875, | |||
JP2000182077, | |||
JP2000207582, | |||
JP2000215325, | |||
JP200066985, | |||
JP200092390, | |||
JP9330230, | |||
WO9304429, | |||
WO9410641, |
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